180742821 has 16 divisors (see below), whose sum is σ = 281040000. Its totient is φ = 103281024.

The previous prime is 180742813. The next prime is 180742829. The reversal of 180742821 is 128247081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (180742813) and next prime (180742829).

It is not a de Polignac number, because 180742821 - 2³ = 180742813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180742829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86796 + ... + 88853.

It is an arithmetic number, because the mean of its divisors is an integer number (17565000).

Almost surely, 2^180742821 is an apocalyptic number.

It is an amenable number.

180742821 is a deficient number, since it is larger than the sum of its proper divisors (100297179).

180742821 is an equidigital number, since it uses as much as digits as its factorization.

180742821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175673 (or 175659 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 180742821 is about 13444.0626672148. The cubic root of 180742821 is about 565.3972417205.

The spelling of 180742821 in words is "one hundred eighty million, seven hundred forty-two thousand, eight hundred twenty-one".